reduce critical path in mkMemSlaveEngine
reduce critical path in mkMemSlaveEngine

Change-Id: I1f09a818f0ba8520556000912116ac35df625ec1

csail-csg/connectal,cambridgehackers/connectal,chenm001/connectal,hanw/connectal,8l/connectal,hanw/connectal,chenm001/connectal,hanw/connectal,hanw/connectal,cambridgehackers/connectal,chenm001/connectal,cambridgehackers/connectal,csail-csg/connectal,chenm001/connectal,chenm001/connectal,cambridgehackers/connectal,hanw/connectal,csail-csg/connectal,csail-csg/connectal,8l/connectal,cambridgehackers/connectal,8l/connectal,8l/connectal,8l/connectal,csail-csg/connectal